Stress analysis of the temporomandibular joint by finite element method

A study was made of the mechanical behavior of the temporomandibular joint under occlusal force using finite element method. A two dimensional numerical model of teeth, mandible, articular disk and temporal bone was divided by 394 triangular elements and 250 nodal points. Loading conditions were expressed as a resultant force of masseter, pterygoid medialis and temporalis under various proportions of loading conditions. To evaluate lack of teeth effects on temporomandibular joint, various supporting conditions were changed.It was suggested that the posterior band of the articular disk between articular surface of mandibular fossa and condyle functioned as the temporomandibular joint shock absorber.